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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79987dd819cf6d2d39fc8f9cf5aeed1a5a7c2100b63d5132ee42e11ede59be6e' 
  AND token = 'aNA1Dpj3Uu6LCaiu2MYtml0GOoZmH0z517znV2n3NgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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