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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5511965c82d5184f71153d824f70b43b4692ad4298a48289c57805fde6b8e24a' 
  AND token = 'vgywMayqBjnO5fZ1DsLMh65de2GXjhKNs4NlxAOr3vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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