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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f365609de18c382cb701afbd28734feb53fe3810c1754337f4c98a311620f3df' 
  AND token = 'EQh+rYbJnSsVRj7umyHDvO8BUJFf017IeI+wcUSJ1yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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