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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f96c67d7344097febbdd2ce9353e2f6354b4e313a2c8555b9abcb187907cb9' 
  AND token = 'e5wJHmY70K6eD15Bz9/lJHbO9N35kJGYan2kFFL1zpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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