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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ecb0be03cdbde95492c2bcf9dd0195995849f64dfb5c8dea5316dfd1cac078' 
  AND token = '/bMTm7OCoG2u3AbnojRbZiwC0BazpCU0YwTNd/OmYpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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