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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4277bd49d6ec415db869b48cd870f889c9ac521a25063ce50bc8cdb4b2c3340e' 
  AND token = '63JRSz4QGEZ3rQtFhRXI4S9+6KKmVF/RYhN86ZaYT80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00159

JSON explain

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