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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75854a4154d113b10a8e589ba5c8437b13290edfe8f28c22642518f0b714481' 
  AND token = 'FPJ80eUjOeYnD/vAWJ/jmkQEYXWr1yONzylHj2ux2Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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