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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f4bc7f75ae576256e9e19f4c1d40fa0cf696b5e867e75606c66ce3f2b01e85' 
  AND token = 'xy4QHN+JSZIdFX4S5pMweiO59BAxfjJEKaI7wclvx5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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