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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372e99f560fe4c36df06eb6f5c4008d8cacdd591518adeffb883bdc6202f8064' 
  AND token = '2BhEND8hPWYCk5ZlZT/KbN9TwBI3rENDo34LGXbNjek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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