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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6088990ae4af625fa30d9aa89597e04383a6db5aaf4e644b7c97b17b27d9437a' 
  AND token = '42FNU6y0hHQvhQfiVOOb9XFQN1v0PZYzpAIUA/ok2MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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