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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32709028031a9e8f0a6c27d6c3b22416c0d5756f392a6735164dee887705c6d4' 
  AND token = 'OT/npx6t8FLtL7LIy6N9/1lI6OUxus2c/oCkqvmhZvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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