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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ee3b2af42fcf24540c6cdde8d04dd8aeb922fafb8881332db936da197c8e28' 
  AND token = 'o/s4wV5z0ijlicayrrk5Ezs9DKn7lMBi51K5EVyXH8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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