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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c9d47b10f36615374afc691fc4c5045c47c565a38448947ac3df6b7943a4650' 
  AND token = 'VS96/szk7ke1v1hH0/JYm7kYrbAE8MgUTEZ0nMiJli4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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