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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec92830adf50c9e81515809f94c5d7888d2938c733f5b7a2ae201fbe90c1630a' 
  AND token = 'VrvaYsmw7McfrH7Kj/MCsLBavfxRTQxElH7NsLXHmSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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