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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c355eed0fa8e9ca8d0d0c3c96d9424f490482c8f161b230facb4eef20d9f2cfa' 
  AND token = '/5Ofg07HF6UG/y7ZciwHRDxCGz4SA5iflWoVI1XpGko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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