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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9e45f8b5938818b7836e41a7bbbffdbbd196afbb785edbe24077afa7c727e8' 
  AND token = 'XRzQ25AREZxY7JfTp+I0fDh/19ZMyWxjJopoyAk65a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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