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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b274cdbbc5b573b5d5396e941afd89f1dbde0ac0c1c699208f97afda0ba0f10' 
  AND token = 'G47uMhF03aop0lkfe7h7WJ5EiAVeC1OEPMAl/c1uDlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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