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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb9c5be7e830aa50aee052c8042ae24a4b18249e54c3cd41b4e1514feec81137' 
  AND token = 'JmtXT0IFfip11s6aXU3mizYSMFGi56nn07alOAQ8/go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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