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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fecfefc0b5660b013fff7327fdece72f2f28fef11709b553704032b4fb8896d1' 
  AND token = 'RTBKmwRC0RLWNEzzFIIvDe6/MGtvSnDdo4mDkU4rzX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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