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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5077031d2eb44b76c76aa6df0af65c49a576ec73c0ecf6b00287328c5698f52e' 
  AND token = 'RNNzMtfcHIHtqU+f0OdDOaAD45cg3Mg+fnnvdtpgtzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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