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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a28746bd88a7b4f132862e774429422c8898c0e2221166a677e38c77b7935a' 
  AND token = 'fESLtJ39+UXykmfrHm/Gb5VNn/Hpj9/7JFc+lw2LZSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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