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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2954866c55d491ed99507919e4a4c4b969095d94da41a85cb04f0d605f338ea4' 
  AND token = 'u753ajZPgp5nA9BRROu9Q12pfXSCdUYGGiWUOHqRQsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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