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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d63c084e8c3a3d3a485649f3403ba92a28c66a4165eb045dd76c9f06531e0c' 
  AND token = 'Pqlht7kL2MWsyofUyUC0FwysjwWdLMf1atauM32ScTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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