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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a0bddf1fb54c961604e483bcf07ada8468e76f0349e4f7b62ffa9f39cb3e48' 
  AND token = 'yq1BCplWTz/XCx0Q37mxVsdtuiKziV4yQsPedHOxCZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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