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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ad8e19e81878659884078c72e05a00e517be5ea34931dfb08fca50d87277c5' 
  AND token = '9idAwSXP2jjSgXMgdg6OafPmiRMudrAbLHs6U1j+IH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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