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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc69b1a61c463de90e0885d943813e56bfd1a05665d194eba0c96dd1833c6954' 
  AND token = 'L8cqbxcXfpInx9fjlatPrFFXV0gmIFcO8PH4ivYoatM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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