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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02786f81bd932894cf5911e29ebfde5c8263f16155b8c6e744f7662e7c515d3c' 
  AND token = 'J/t5AnrrQdzUBUQDCCCOe6XX7VbflsQgxDGcMe65B6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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