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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f464d2c17ca95440bdc43dbd9865e6e661c17578f86eeef601fb856ac231e1' 
  AND token = 'aC3Iu2TjokTHAO1h35Ld1bH4rs4vkAQxHfd5bVeNn/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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