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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e89d9ef3089e376fd1062efe527a0a7f8213fb6eceefdb780b380f5bee94338' 
  AND token = '/8Cwm7t5HYJP2svLI7Xejoncz/nfmqJclW0Ij0dVpxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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