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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84d4f7de225c621f88558e1f6efd91dce0f6296f2a84c4ae547364aeb4cb913' 
  AND token = 'aOA6y6Pfovw9M+JdO3OlHNyJfGyPF5g97dkrL0HjlLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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