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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a27c7b76811a8f51e7bda6868237b1f1bc82a7c4e20e0494b20f3d567b7ec8b' 
  AND token = 'DO2n/oyKXInyIB9gdc6A/DPMejZARUkb8lCDvHRl05c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}