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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3964743dd98b7fe1810e87ca662de06e174b1627441b42e61ecc542171f9bf8' 
  AND token = '1vHjlLz36+4LsnL3FPXrI7XO1GiBJwsPeZ0SJbFvQrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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