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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f36cce2dd1c25b6662f05c4d98a19ab55de8c177684025d624fdf125819e19' 
  AND token = 'AI2oMXv81cw94SC/sJJfTwJ10OZ6/uNV6PrC12pclt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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