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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7165746999d0521d5de7f4a046609c7e7096d42554fae8e3e0839c21a955a6e1' 
  AND token = 'rFMoLzfC/SNwQ5f+UeuiLjZjAqOGnlKs/YCL5HnLFRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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