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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd931cfc708a18bc7f9a51be2b5902f9739f6a2e5227c1fcac55b3440e9977d74' 
  AND token = 'p6bvgWRk/vIdSHPfhj81oIXaBu/Gtjw4T60+1aaBRMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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