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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8f24ec681d4be52b57c9749df72d23383f0b2f9ae467ab3949bff3fb631009' 
  AND token = 'FlgyExt/qv3adEQlvYHex1es2W64C7afSNXmymVa+Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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