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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ecd77b41d1b31d62f5da80cfbab40855a3b5878b4ac6c30852858c0f2fcf21f' 
  AND token = 'mkwGcbfqbxJX9wP6JBDBB0TP6bA4dE5FCOJFwJWVWeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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