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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd152831decb3a0a881efded0890216809f59ce6b1a974aedc0326c5cdffa963' 
  AND token = 'hVz6C0V1XEB9KMO2d0BFwBCt73fj/BXMvg1M3o7mhho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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