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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c024fd58565df66074d5fbae3c59e6a576d95f9c09f6c908ac934a28b513fb8' 
  AND token = 'O5Zc/R1Rcpxu7JtyH1+kj0Pf307n9vXg7HOjs2jqBJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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