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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fc739306209452453897fbb015163dd8d0d6e8ee88a384e55afa81c0d7e276' 
  AND token = '//sWSoMoyb5Hmvgftw9VnUmIKLu8EAoGl7+6PV5WJRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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