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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8823e088c6c2eb17cfa1861111010b45240d43ee4ddd5146cd858736b00359ee' 
  AND token = 'pNHIf/j5EEn98OZ9xltkz7MsEM5b0VBF2XCu1tPllyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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