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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15060220d700972d9f39c93152b6a83236e03c3f75ce602ed3c7b3930a73003' 
  AND token = 'fRA6gs7MOZwK+t4H+9HpRRqYpKYRtBRr9lMHyYDpPo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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