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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a224e09eba1980d4a3539ba1d8919aaef8db64dabc59c738dd426d0db86251' 
  AND token = '3B9e7M5MRafdbfchcIVx2s7tuBrcByKLJUFqBTEyknA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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