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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c564aecc788f779ec3fa065c72dc6c222197b76c62f3706080cbae23ae9d7983' 
  AND token = 'EeernjvXSqBi98hXhV7H45/NXtFmH/fyCshIvZE9vyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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