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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d0ff7ed78180a5fdea67cc5ec66b8841c7742fb836427b84e2f39dccb73f89' 
  AND token = 'EwOXlMj04x0SUHP7zx7qlY99qxkELq3AKEowE63vPFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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