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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02cf39f94da2b7c04a16718528a433d362bcb6fcec10b8f1554ea830f6716580' 
  AND token = 'hdW+oK5cfre/oT7AX0LlQsNOn7vMoC+9t3/HptysXL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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