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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65919ee75c7fd19d45717de16252a9370fa61427e0df8585c4ea32b177bbc7e6' 
  AND token = 'dIPChKEk1TRTpSQgI9vDUZp5f5WhaS1kK47P/clq1QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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