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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99ea12c604e1465f856ab65c84b00ba0155749ff951b938577225dfa2a42b48' 
  AND token = 'B+h6Tny3MxXWkGuuacmxChm8m16sZipWHRJuEPNJ1ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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