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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0dda6b9fec739f599f2f0e1e1982d4ba0fd1fe180b70f75a86e41281d665cf' 
  AND token = 'SgCQXPc1Dzs2KQZSN1nJPpIQbGEc+x35Ur6nQAaZo8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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