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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2650aa99b78317d148b5ccd7d1d2970a5463522d9c414e69c58ef65ddd08a0f1' 
  AND token = 'n9x3My0qEcf2KRz3VSR6gSX/igZpfFKDEOYhHIYo/os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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