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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e57a82bba3bd8cb63a185bb24c2c9cd1d4cbae2d8c62a85bea62a63320b837' 
  AND token = 'wNB2fPW9Md2LhzeZBiHKdkCzomJcL/17J9PUh26YwCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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