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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf224764d2d1d44ad795abd55b4facd26f3065d9382b15f642716f2aa53ab574' 
  AND token = 'aH9zkOcgbXoS6AjuWROlAgZ/2ksgX/iCgSwyaZrICyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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