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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda056ea1c62f3a877bc172677a0b46236eabcc256180d15e15a24e093e6d64f' 
  AND token = '9aB+mbhCC+C5beC6vZ6kDeGrp7lOFwrcGqZfbmHxDYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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