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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe24e35439309f8bdcd314523c372c0fd1fffc12e5a80f947bc1e792e5d072cc' 
  AND token = 'iDXfA/uR1b9Z90le6qVPgntLNcFcqjzQlDRqz11Qfb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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