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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ca1756860de267cb914503cad5440974a188850490a291a0259f6e8966afac' 
  AND token = 'HIQj/D6IdWCu6Q4I/ErfcKo28HxSUNYlLeqzTWQSnWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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