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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ecb7db0d5b5f1e4fd00109adeb974960c5a5e8ea2fc2de79ea81d7a1162ce1a' 
  AND token = 'Nk6UAR9mgQ6j64wS4stkkep8l3zWCyObJXvPs6OacR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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