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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a281f4372584ba5eac3c892d7135cda08684862c827da0e7bbae13c171922c2' 
  AND token = 'LW7eswna48uMh+fflkp54jFPFftMXLMUWosjM0Y8r6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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