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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8e5218861b0dd305c5add314bda410c45d1e00d6930b1f084265c48d6380e6' 
  AND token = 'W/HTQ5lYgjGrSk49CIKgRXjwMnaec+KzGNSITLive0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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