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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '605c182628a63e6135f366ba09b2d3248c93095c9706230e2a7a8d13c1a735b2' 
  AND token = '91WQ+d4fmweZqdXWmw01MVTcOY6y2zqOaqVJBZ4JnfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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