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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6daecb1d00ff9cd0ef1ddc2d9a8caa8a9adf651d0a1f80458a2be56205abf54' 
  AND token = 'dByVrkmQZytPyHZ/jsdwBTEB1R5XRlmr+5GNNs2IVOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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