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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11087ba3c020e9c3ff8952c85008be8779659a8db2f28f80b81d7aadb981dab' 
  AND token = '7w6ri0ox7fnJiwyPdLBzTcGiRjQBsvaiiVNZa4jDLdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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